Fundamentally, you will not be making use of much of the energy coming from electricity firms so there is a chance that your monthly expenses will be lowered by more than half. The preliminary expenditure for renewable energy sources can be high, but it's well worth the money.
We are always asking for cheap electricity, especially the people in Illinois because the price of electricity is continuously increasing. It is said that the cost of electricity will be higher in 2015, but it will probably be slower compared to 2014.